package dhtpdud;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Java_4_4 {
	public static void main ( String[] args )
			throws java.io.IOException {
			
			int jumsu;
			char hakjum;
			String iput;
			
			System.out.println("***** result *****");
			System.out.print("Input jumsu : ");
			InputStreamReader kkk = new InputStreamReader(System.in);
			BufferedReader bbb = new BufferedReader(kkk);
			iput = bbb.readLine();
			jumsu = Integer.parseInt(iput);
			
			if(jumsu >= 90)
				hakjum = 'A';		
			else if(jumsu >= 80)
				hakjum = 'B';	
			else if (jumsu >= 70)
				hakjum = 'C';	
			else if (jumsu >= 60)
				hakjum = 'D';
			else
				hakjum = 'F';
			
			System.out.println("Hakjum : "+hakjum);
			
		}
}
